diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ead8445
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+**/*.swp
diff --git a/plugin/rubyhash.vim b/plugin/rubyhash.vim
index 9531d66..5828d88 100644
--- a/plugin/rubyhash.vim
+++ b/plugin/rubyhash.vim
@@ -9,46 +9,13 @@ if g:rubyhash_map_keys==1
 endif
 
 function! ToSymbolKeysLinewise()
-  :ruby Convert::to_symbols
+  call setline('.', substitute(substitute(getline('.'), '[''"]\(\w\+\)[''"]\(?=\s*=>\)', '\1:', 'g'), '\(\(?:\{|,|^\)\s*\)\(\w\+\):', '\1:\2 =>', 'g'))
 endfunction
 
 function! To19KeysLinewise()
-  :ruby Convert::to_19
+  call setline('.', substitute(substitute(getline('.'), ':\(\w\+\)\s*=>', '\1:', 'g'), '[''"]\(\w\+\)[''"]\s*=>', '\1:', 'g'))
 endfunction
 
 function! ToStringKeysLinewise()
-  :ruby Convert::to_strings
+  call setline('.', substitute(substitute(getline('.'), ':\(\w\+\)\(?=\s*=>\)', '"\1"', 'g'), '\(\(?:\{|,|^\)\s*\)\(\w\+\):', '\1"\2" =>', 'g'))
 endfunction
-
-ruby << EOF
-module Convert
-  def self.to_symbols
-    search_and_replace([ 
-      { :search => /['"](\w+)['"](?=\s*=>)/, :replace => ':\1' },
-      { :search => /((?:\{|,|^)\s*)(\w+):/, :replace => '\1:\2 =>'}
-    ])
-  end
-
-  def self.to_strings
-    search_and_replace([
-      { :search => /:(\w+)(?=\s*=>)/, :replace => '"\1"'},
-      { :search => /((?:\{|,|^)\s*)(\w+):/, :replace => '\1"\2" =>'},
-    ])
-  end
-
-  def self.to_19
-    search_and_replace([
-      { :search => /:(\w+)\s*=>/, :replace => '\1:'},
-      { :search => /['"](\w+)['"]\s*=>/, :replace => '\1:'},
-    ])
-  end
-
-  private
-
-  def self.search_and_replace(patterns=[])
-    contents = VIM::Buffer.current.line
-    patterns.each { |params| contents.gsub!(params[:search], params[:replace]) }
-    VIM::Buffer.current.line = contents
-  end
-end
-EOF